The Observer Pattern

The Observer Pattern is a design concept used in programming where one object, known as the "subject," maintains a list of "observers" that are interested in its state. When the subject changes, it automatically notifies all registered observers, allowing them to update themselves accordingly. This is similar to a news website that alerts subscribers when new articles are published. This pattern promotes loose coupling, as observers can be added or removed without affecting the subject, making systems more flexible and easier to maintain.